Create an empty deterministic world using raw ARC colors 0-15.

Replace the static color and collision layers without creating actors.

Set the integer camera origin and viewport, up to 64 by 64 cells.

Create a generic actor; cells are [local_x, local_y, optional_color].

Update only the provided generic actor state and transform fields.

Delete an actor and automatically remove ECE rules that reference it.

Split one actor by partitioning all of its local topology cells.

Merge actors into the first ID using their rendered world topology.

Bind ACTION1-4 to up/down/left/right movement for an actor.

Attach actor ECE code. Use actor.value predicates and frame N effects.

condition_code supports and/or, for example: actor.visible == true and (actor.color == 8 or action.id == 6). ACTION6 coordinates are action.x and action.y. Effects use one operation per line, for example frame 0: actor.recolor(8) followed by frame 1: actor.rotate_to(actor_2, 1, -1). Invalid code is rejected with an agent-facing line/column error. Legacy structured fields remain accepted.

Apply an effect when one actor collides with another actor or static map.

Apply an effect when ACTION6 clicks the source actor.

Apply an actor effect on discrete action ticks, not wall-clock time.

Advance one deterministic turn; ACTION6 uses viewport click coordinates.

Compare a real ARC frame against the model's current rendered viewport.

Clone the complete native world for later rollback.

Restore a previously named native snapshot.

Return rendered layers, actors, rules, hashes, trace, and debug history.